[Server thread/ERROR]: Could not load 'plugins\Mysql + Chat.jar' in folder 'plugins'
org.bukkit.plugin.InvalidPluginException: java.lang.IllegalArgumentException: Plugin already initialized!
        at org.bukkit.plugin.java.JavaPluginLoader.loadPlugin(JavaPluginLoader.java:139) ~[spigot-1.14.4.jar:git-Spigot-9de398a-9c887d4]
        at org.bukkit.plugin.SimplePluginManager.loadPlugin(SimplePluginManager.java:334) ~[spigot-1.14.4.jar:git-Spigot-9de398a-9c887d4]
        at org.bukkit.plugin.SimplePluginManager.loadPlugins(SimplePluginManager.java:253) [spigot-1.14.4.jar:git-Spigot-9de398a-9c887d4]
        at org.bukkit.craftbukkit.v1_14_R1.CraftServer.loadPlugins(CraftServer.java:350) [spigot-1.14.4.jar:git-Spigot-9de398a-9c887d4]
        at net.minecraft.server.v1_14_R1.DedicatedServer.init(DedicatedServer.java:194) [spigot-1.14.4.jar:git-Spigot-9de398a-9c887d4]
        at net.minecraft.server.v1_14_R1.MinecraftServer.run(MinecraftServer.java:776) [spigot-1.14.4.jar:git-Spigot-9de398a-9c887d4]
        at java.lang.Thread.run(Unknown Source) [?:1.8.0_202]
Caused by: java.lang.IllegalArgumentException: Plugin already initialized!
        at org.bukkit.plugin.java.PluginClassLoader.initialize(PluginClassLoader.java:167) ~[spigot-1.14.4.jar:git-Spigot-9de398a-9c887d4]
        at org.bukkit.plugin.java.JavaPlugin.<init>(JavaPlugin.java:52) ~[spigot-1.14.4.jar:git-Spigot-9de398a-9c887d4]
        at me.Vercy.MainClass.<init>(MainClass.java:17) ~[?:?]
        at me.Vercy.Mysql.MysqlConnection.<init>(MysqlConnection.java:16) ~[?:?]
        at me.Vercy.MainClass.<init>(MainClass.java:19) ~[?:?]
        at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) ~[?:1.8.0_202]
        at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source) ~[?:1.8.0_202]
        at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source) ~[?:1.8.0_202]
        at java.lang.reflect.Constructor.newInstance(Unknown Source) ~[?:1.8.0_202]
        at java.lang.Class.newInstance(Unknown Source) ~[?:1.8.0_202]
        at org.bukkit.plugin.java.PluginClassLoader.<init>(PluginClassLoader.java:71) ~[spigot-1.14.4.jar:git-Spigot-9de398a-9c887d4]
        at org.bukkit.plugin.java.JavaPluginLoader.loadPlugin(JavaPluginLoader.java:135) ~[spigot-1.14.4.jar:git-Spigot-9de398a-9c887d4]
        ... 6 more
Caused by: java.lang.IllegalStateException: Initial initialization
        at org.bukkit.plugin.java.PluginClassLoader.initialize(PluginClassLoader.java:170) ~[spigot-1.14.4.jar:git-Spigot-9de398a-9c887d4]
        at org.bukkit.plugin.java.JavaPlugin.<init>(JavaPlugin.java:52) ~[spigot-1.14.4.jar:git-Spigot-9de398a-9c887d4]
        at me.Vercy.MainClass.<init>(MainClass.java:17) ~[?:?]
        at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) ~[?:1.8.0_202]
        at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source) ~[?:1.8.0_202]
        at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source) ~[?:1.8.0_202]
        at java.lang.reflect.Constructor.newInstance(Unknown Source) ~[?:1.8.0_202]
        at java.lang.Class.newInstance(Unknown Source) ~[?:1.8.0_202]
        at org.bukkit.plugin.java.PluginClassLoader.<init>(PluginClassLoader.java:71) ~[spigot-1.14.4.jar:git-Spigot-9de398a-9c887d4]
        at org.bukkit.plugin.java.JavaPluginLoader.loadPlugin(JavaPluginLoader.java:135) ~[spigot-1.14.4.jar:git-Spigot-9de398a-9c887d4]
        ... 6 more